1 /* |
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2 * Copyright (c) 1996, 2005, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 package sun.rmi.transport.proxy; |
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26 |
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27 import java.io.BufferedInputStream; |
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28 import java.io.IOException; |
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29 import java.net.ServerSocket; |
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30 import java.net.Socket; |
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31 import sun.rmi.runtime.Log; |
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32 |
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33 /** |
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34 * The HttpAwareServerSocket class extends the java.net.ServerSocket |
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35 * class. It behaves like a ServerSocket, except that if |
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36 * the first four bytes of an accepted socket are the letters "POST", |
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37 * then it returns an HttpReceiveSocket instead of a java.net.Socket. |
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38 * This means that the accept method blocks until four bytes have been |
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39 * read from the new socket's input stream. |
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40 */ |
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41 class HttpAwareServerSocket extends ServerSocket { |
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42 |
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43 /** |
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44 * Create a server socket on a specified port. |
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45 * @param port the port |
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46 * @exception IOException IO error when opening the socket. |
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47 */ |
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48 public HttpAwareServerSocket(int port) throws IOException |
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49 { |
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50 super(port); |
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51 } |
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52 |
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53 /** |
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54 * Create a server socket, bind it to the specified local port |
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55 * and listen to it. You can connect to an annonymous port by |
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56 * specifying the port number to be 0. <i>backlog</i> specifies |
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57 * how many connection requests the system will queue up while waiting |
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58 * for the ServerSocket to execute accept(). |
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59 * @param port the specified port |
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60 * @param backlog the number of queued connect requests pending accept |
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61 */ |
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62 public HttpAwareServerSocket(int port, int backlog) throws IOException |
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63 { |
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64 super(port, backlog); |
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65 } |
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66 |
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67 /** |
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68 * Accept a connection. This method will block until the connection |
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69 * is made and four bytes can be read from the input stream. |
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70 * If the first four bytes are "POST", then an HttpReceiveSocket is |
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71 * returned, which will handle the HTTP protocol wrapping. |
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72 * Otherwise, a WrappedSocket is returned. The input stream will be |
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73 * reset to the beginning of the transmission. |
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74 * In either case, a BufferedInputStream will already be on top of |
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75 * the underlying socket's input stream. |
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76 * @exception IOException IO error when waiting for the connection. |
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77 */ |
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78 public Socket accept() throws IOException |
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79 { |
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80 Socket socket = super.accept(); |
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81 BufferedInputStream in = |
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82 new BufferedInputStream(socket.getInputStream()); |
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83 |
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84 RMIMasterSocketFactory.proxyLog.log(Log.BRIEF, |
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85 "socket accepted (checking for POST)"); |
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86 |
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87 in.mark(4); |
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88 boolean isHttp = (in.read() == 'P') && |
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89 (in.read() == 'O') && |
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90 (in.read() == 'S') && |
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91 (in.read() == 'T'); |
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92 in.reset(); |
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93 |
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94 if (RMIMasterSocketFactory.proxyLog.isLoggable(Log.BRIEF)) { |
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95 RMIMasterSocketFactory.proxyLog.log(Log.BRIEF, |
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96 (isHttp ? "POST found, HTTP socket returned" : |
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97 "POST not found, direct socket returned")); |
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98 } |
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99 |
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100 if (isHttp) |
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101 return new HttpReceiveSocket(socket, in, null); |
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102 else |
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103 return new WrappedSocket(socket, in, null); |
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104 } |
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105 |
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106 /** |
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107 * Return the implementation address and implementation port of |
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108 * the HttpAwareServerSocket as a String. |
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109 */ |
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110 public String toString() |
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111 { |
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112 return "HttpAware" + super.toString(); |
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113 } |
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114 } |
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